My in-laws have a restaurant and I am able to order fish meal thru their food provider. I believe it is from Sysco. I buy it in 25lb bags for $25. I also use corn meal mix, corn flour, and cornmeal in a ratio of 50:25:25 then add seasonings of choice.

Any meal will work. But the secret (not really a secret but for some reason most are unaware of it) is I take a shower towel and pat my fish totally dry before I drop them in the meal. Then I meal them. When they come out of the meal they look like they don't have near enough on them, but they do. Drop them in the grease and they come out perfect and crispy.